[PATCH 3.12 56/62] n_tty: Fix missing newline echo

Greg Kroah-Hartman
2013-12-10T08:02:40Z

From: Peter Hurley <peter@hurleysoftware.com>

commit 39434abd942c8e4b9c14c06a03b3245beaf8467f upstream.

When L_ECHONL is on, newlines are echoed regardless of the L_ECHO
state; if set, ensure accumulated echoes are flushed before finishing
the current input processing and before more output.

Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com
Tested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/tty/n_tty.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -810,7 +810,8 @@ static void process_echoes(struct tty_st
struct n_tty_data *ldata = tty->disc_data;
size_t echoed;

- if (!L_ECHO(tty) || ldata->echo_commit == ldata->echo_tail)
+ if ((!L_ECHO(tty) && !L_ECHONL(tty)) ||
+ ldata->echo_commit == ldata->echo_tail)
return;

mutex_lock(&ldata->output_lock);
@@ -825,7 +826,8 @@ static void flush_echoes(struct tty_stru
{
struct n_tty_data *ldata = tty->disc_data;

- if (!L_ECHO(tty) || ldata->echo_commit == ldata->echo_head)
+ if ((!L_ECHO(tty) && !L_ECHONL(tty)) ||
+ ldata->echo_commit == ldata->echo_head)
return;

mutex_lock(&ldata->output_lock);